Paper container having body with renitent neck and process of making same



Sept. 25, 1928. 1,685,370 A. MOORE PAPER CONTAINER HAVING BODY WITHRENITENT NECK AND PROCESS OF MAKING SAME Filed Nov. 5, 1925 m ggsmm 7 H31" Patented Sept. '25, 1928.

UNITED STATES v 1,685,370 PATENT OFFICE.

ARLINGTON MOORE, OF WORCESTER, MASSACHUSETTS.

PAPER CONTAINER HAVING BODY WITH RENITENT NECK AND PROCESS OF MAKINGSAME Application filed November 5, 1923. Serial No. 672,758.

, My invention consists in a paper container having a body with renitentneck and process of making same. I

A. paper container comprising a body having arenitent neck to receivethe closure or head is of great utility in the art of paper containers,in that it is adapted to receive a head which may be considerably oversize, and when such a head is inserted, or, as I prefer to term it,planted,'therein and the neck is thereby expanded, the head is securelyheld and clamped in place and atight, hermatic seal is secured,becauseof the quality of renitence or resilience possessed by such neck,or in other words, its capacity after being expanded to contract or tendto contract to sub stantially original dimension.

I have discovered that when the margin of a paper container body isreenforced as by heing turned inwardly in two or more folds, and suchreenforced part is consolidated together with the body and calenderedunder very high pressure, so as to form a reenforced and con solidatedrim partof substantially permanent gage dimension, and the adjacent partof the body or neck is formed or drawn without being subjected to suchhigh consolidating pressure and calendering, as may be done by relievingor cutting away the forming die or tool in such neighborhood. suchuncalendered portion is bowed inwardly in cross-section and provides arenitent or elastic neck portion adapted to yield' outwardly when a heador end of outer diameter somewhat in excess of the inner diameter of theneck part is inserted or planted therein, and ada ted for clamping andhermetically sealing t e head when in place by the contractileforceexerted due to tendency of the elastic neck portion to resume 40the original unexpanded state.

A supporting shoulder is preferably provided at the base of the renitentneck portion to limit the inward movement of the head, upon insertion orplanting, in correct posi- I tion with respect to the expandible andcontractile neck. Such shoulder portion is uncalenderedand is- -a-daptedto be expanded against its contractile tendency when a head is inserted.If desired, the filled container may be supported externally when a headis being inserted by annular supporting means applied under saidshoulder.

An illustrative form of paper container is shown in the accompanyingdrawings, to-

a get-her with a. diagrammatical illustration: of

amode of carrying out the process, but it is to be' understood that sameare only for illustration of the principle of the invention and are notto impose limitations thereon.

In said drawings, Fig. 1 is a partial side view of the upper or mouthend of a paper container embodying my invention. Fig. 2 is afragmentarysectionalviewof a female die with a two-ply body blank inplace therein, having the margin folded inwardly preliminary toapplication of consolidating pressure by the male die. Fig. 3 showsapplication to such marginal portion of consolidating ressure by themale die, which also serves to draw the shoulder in the body wall. Fig.4 shows t-he position taken by the body parts after the pressure isreleased and the male die withdrawn. Fig. 5 shows a flanged headabout-to be inserted or planted in the body neck. Fig. 6 is an enlargedsectional view showing the head of Fig. 5 in place and showing in dottedlines the position from which the neck has been expanded by theinsertion of the head, and to which it will contract upon removal of thehead. Fig. 7 shows a disk head in place in the container body, and Fig.8 a flanged head in place therein with a disk inserted in the flangedhead.

Reference character 10 indicates generally a paper container body. Sameis shown as a tapered or frusto-conical body for convenience in nesting,but cylindrical and various other forms and shapes may be used. The bodyis illustrated as of two-ply material, but material having any desirednumber of plies 90 may be used, and the term paper is used as a genericterm to indicate any suitablematerial of paper-like character.

The edge of the body wall 10 is preferably reenforced by being turned inon itself in one or more folds, one inturned fold 12 bein in-v dicatedin Fig. 2. The lip or margin 0 the body wall and the inturned part 12 isrigidly set and consolidated with the adjacent part ofthe body wall byapplication of extremely 100 high pressure, which may be in theneighborhood of four or five tons per square inch, and is-referred toherein for convenience as consolidating pressure. The application ofpressure is preferably performed in a spinning 105 operation, and inFig. 2 the female or receiving die is indicated at 14. The body blank 15preferably extends initially somewhat beyond the female die 14, so as toprovide suflicient material for the formed up portions. 110

stantially consolidated or welded together to form a structure ofsubstantially permanent gage dimension very hard, smooth, highly glazedand of great strength, and the parts thereof, if separable at all, canbe pulled apart only with considerable difiioulty. I prefer to designatesuch rim a fabricated rim.

In the region where the consolidating and calendering effect is notdesired, however, a

relief is formed in one die or tool with respect to the other, asindicated in male die 16 at the region 20. Male "die 16 is preferablyprovided with a fiang'ei-lfljvhich serves to depress the foldedov'ermargin of the body blank within the female die and assures that there issulficient stock within the mouth of the female die to make the formedup portion. I have found that when a part of the body, as 22, is thusleft uncalendered adjacent to the highly calendered, consolidated andsmoothly glazed lipor rim portion 24, the body will be found afterremoval of the male die, as indicated in Fig. 4, to contract and to bebowed inwardly in cross-section in such neighborhood, as indicated at26, Fig. 4, and, not being subjected to the extremely high calenderingand consolidating pressure, the paper in this neigh borhood 26 is ofabout the same thickness as it was originally. Furthermore, its innersurface may be of a relatively rough or frictional nature so as to exerta gripping action or frictional holding action upon the contacting part.of an inserted lid. In connection with the inward contraction andbowing inward of the uncalendered portion 22 after the tools areremoved, the lower part of the highly calendered and consolidated rim ormargin, that is to say, the portion thereof marked 24' (Fig. 4) is foundto be tipped or tapered inwardly to some extent, though its contractionis comparatively slight because of the high degree of calendering andconsolidation to which it has been subjected. 1

The tools are preferably of such form as 'to draw a shoulder 28 at orabout the lower or inward terminus or base of the uncalendered andnon-consolidated neck portion 22, and preferably the die or tool reliefis extended to include the shoulder forming portions 30 and 32 of thedies or tools, so that, after the shoulder is drawn, shoulder portion 28has substantially the same characteristics as the part 22, that is tosay, that after being formed into a shoulder, the material making up theshouldered portion is elastic and is in substantially the normalcondition of paper and not consolidated or calendered and made rigid bybeing subjected to the enormous pressure to which the lip portion 24 hasbeen subjected. This will be plain from the showing in Fig. 3 wheresubstantially the same amount of space or clearance is providedbetweenthe dies atthe shoulder drawing portions 30, 32 as there is between themat the double or folded marginal portion 24. i

The uncalendered inwardly bowed portion 26, produced as in the mannerdescribed, may be described as renitent or elastic, that is to say, whena head 34 is inserted therein, as by a pusher 35, for example, whichhead 34 has an outer diameter somewhat in excess of the inner diameterof part 26, the latter is expanded and exerts a Very substantialcontractile force on the inserted or planted head. This contractileeflect is indicated in dotted lines in Fig. 6, wherein a flanged head 34is shown inserted or planted in the body neck and resting againstshoulder portion 28, the dotted lines showing substantially the normalunexpanded position of portion 26 and the full lines the expandedposition. It will, of'course, be understood that the showing in thedrawings is necessarily more or less diagrammatical.

The head 34 may be domed or diaphragmed to advantage, as indicated at34. lVhen inserted with the diaphragmed portion down as shown in Fig. 5,most of the air in the top of the filled body is expelled in theoperation of applying the head and suflicient air space is left by thediaphragmed portion 34 being reversed in the seating operation as shownin Fig. 6. An annular support 35 may be provided for supporting thecontainer by the shoulder 28 during the operation of planting the head.

Heads of other forms may be used, as, for example, the disk head 36shown in Fig. 7 may be inserted to expand the neck, and be held in placeby the contractile force exerted thereby, but flanged heads may bepreferred, as they may be made with flanges of substantial depth tosecure a sealing engagement of substantial width and the relatively deepflange can be made continuous and extremely smooth to secure a hermeticseal, whereas with the disk head the edges of the disk are liable to bemore or less chipped or broken and the region of contact is relativelynarrow.

When the opening in the female die is substantially cylindrical, asshown herein, and a cylindrical head is inserted, as shown in Figs. 5and 6, the ultimate form of closure with head in place may besubstantially cylindrical I including shoulder 28 may thus be expandedneck portion, which contracts above the disk after same has been plantedagainst the shoulder. Where flanged heads are used, they may be made oflighter material as one-ply material of flangedhead 34 shown in Fig. 8,and a disk 36 inserted within the flanged head 3% to give it additionalstifi'ness to thereby insure maximum expansion of the renitent neck andconsequently maximum lid holding or looking effect. Various other formsof head constructions may be used.

The invention is not limited to the particular showing made for thepurpose of aflo rding an understanding thereof, but is of the scopedefined in the following claims.

I claim:

1. A paper container body having a shoulder for limiting the extent oflid insertion, and having an inturned marginal portion spaced at amaterial distance beyondsaid shoulder, the body wall between saidshoulder and the inturned marginal portion being formed into a renitentand normally inwardly bulged portion adapted to be expanded by aninserted lid and to exert a gripping action on the lid. y a

2. A paper container body having a shoulder for limiting the extent oflid insertion, a substantially rigid consolidated marginal portionspaced a material distance beyond the shoulder, and the body wall beingformed into a renitent and normally inwardly bulged portion between theshoulder and the consolidated margin adapted to be expanded by aninserted lid and to exert a gripping action on the lid. w

3. A paper container body having a shoulder for limiting the extent oflid insertion, a substantially rigid highly consolidated mar ginalportion spaced a material distance beyond the shoulder, and the bodywall being formed into a relatively broad renitent and normally inwardlybulged portion between the shoulder and the consolidated margin, and alid-having a substantially cylindrical flanged portion inserted in thebody against said shoulder, said renitent portion of the body wall beingexpanded by said lid and serving to exert a gripping action on theflanged lid in a belt or annulus of substantial breadth.

4. The combination with a paper container body having a reenforcedsubstantially consolid-ated marginal rim highly glazed and of highsmoothness. a renitent, normally inwardly bowed neck portion, thesurface whereof is unglazed and substantially frictional, and a shoulderat the base of the neck portion, of a flanged head of diameter in excessof the normal inner diameter of the inwardly bowed neck insertedtherein, seat-ed against said shoulder and held in place by thecontractile tendency of the body portion contacted thereby..

5. The combination with a paper container body having an inwardly turnedsubstantially consolidated glazed rim of high smoothness, and arenitent, normally inwardly bowed neck portion adjacent thereto, thesurface whereof is unglazed and of substantially frictionalcharacteristic, and a renitent drawn shoulder at the base of said neck,of a head inserted in said neck, said head being of a size to expand thebowed portion of the neck into substantially cylindrical form.

6. The combination witha paper container body having a normally inwardlybowed renitent neck portion and a shoulder at the base of the neckportion, of a flanged head inserted within the neck portion and of asize to expand the neck portion into substantially cylindrical form, anda disk inserted within the head flange.

' In testimony whereof, I have signed in name hereto.

ARLINGTON MOORE.

